1211000102001 has 6 divisors (see below), whose sum is σ = 1749222369570. Its totient is φ = 807333401328.

The previous prime is 1211000101951. The next prime is 1211000102017. The reversal of 1211000102001 is 1002010001121.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 1210088001600 + 912100401 = 1100040^2 + 30201^2 .

It is not a de Polignac number, because 1211000102001 - 2⁶ = 1211000101937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 134555566889 = 1211000102001 / (1 + 2 + 1 + 1 + 0 + 0 + 0 + 1 + 0 + 2 + 0 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (1211000102071) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 67277783436 + ... + 67277783453.

It is an arithmetic number, because the mean of its divisors is an integer number (291537061595).

Almost surely, 2^{1211000102001} is an apocalyptic number.

It is an amenable number.

1211000102001 is a deficient number, since it is larger than the sum of its proper divisors (538222267569).

1211000102001 is a wasteful number, since it uses less digits than its factorization.

1211000102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134555566895 (or 134555566892 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1211000102001 its reverse (1002010001121), we get a palindrome (2213010103122).

The spelling of 1211000102001 in words is "one trillion, two hundred eleven billion, one hundred two thousand, one".